This descripition is second hand from my father. He was a radar operator at Brunswick Navy Air Station from 1954-58. The guys that were on watch called everyone over. They said we have been watching this for a few minutes. And it wasn't declared so they tracked it. It went level for quite a distance then it flew off the radar. The radar at the time went across for a distence. The other Doppler {The best at the time} went from up to down. Up it maxed out at 150K. He said they watched the aircraft move across and then it went staight up and up, right off the radar. I asked him it it could have been a missile he said they didn't have any at the time?